﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    class swallow:birdtype
    {
        public void southfly() 
        {
            Console.WriteLine("向南飞");
        
        }
        public override void cry()
        {
            base.cry();
            Console.WriteLine("啾啾啾");
        }
    }
}
